s 516

S516 is an active CKD-516 metabolite and is a potent inhibitor of tubulin polymerization(IC50 of 4.29 μM), has marked antitumor activity.

Prexasertib (LY2606368) is a selective checkpoint kinase 1 (CHK1) inhibitor (Ki 0.9 nM, IC50<1 nM). Prexasertib causes double-stranded DNA breaks and replication mutations, leading to apoptosis. Prexasertib has antitumor activity.

Valecobulin hydrochloride (CKD-516 hydrochloride) is the valine prodrug and vasoblocker of S516. Valecobulin hydrochloride (CKD-516 hydrochloride) has a potent inhibitory effect on β-tubulin polymerization and has significant anti-tumor activity against solid tumors in mice and humans.

Prexasertib dihydrochloride (LY2606368) is an ATP-competitive CHK1 inhibitor (Ki: 0.9 nmol/L). in the cell-free assay, its IC50 values are 8 nM and 9 nM for CHK2 and RSK, respectively.